With three kids under five, I can tell you the nursery is the cheap part.

Everyone braces for the pram, the cot, the car seat. The gear you buy once and photograph for the grandparents. But that’s not what reshapes a budget, or a spending plan as we prefer to call it. What really changes things is the new set of ongoing costs that turns up. Nappies. Formula, if breastfeeding isn’t an option. Childcare down the track. A bigger grocery shop. And they all land at the exact moment the household income often takes a hit.

Costs up, income down, all at the same time

One of you might be off work for a stretch. That’s the money side of having a kid in a nutshell: costs go up and income goes down, simultaneously. It’s not one big expense you can save for and tick off. It’s a squeeze from both directions at once.

Government Parental Leave Pay can help bridge some of the gap, but for most families it doesn’t replace the full second income — especially once you factor in employer top-ups (or the lack of them) and how long you actually take off.

This is even trickier if your pay already moves around. If your income depends on overtime, shutdowns, wet weeks, bonuses or commissions, you might have quietly calibrated your spending to the good fortnight, because that’s the one that feels normal. Add a baby and a partner on leave, and the lean fortnight stops being an annoyance and starts being a problem.

Have the conversation early

The best thing you can do costs nothing: sit down together, well before the baby arrives, and ask each other plenty of questions. Some of the big ones:

• How many children do we want, and who’s having time off work?
• If or when you go back, what’s the expectation? Part time, casual, or full time?
• When will childcare start, and what type of preschool?
• Where do we want the kids to go to school, public or private?

You won’t have final answers to all of these, and that’s fine. The point isn’t to lock in a twenty-year plan. It’s to make sure you’re both working from the same rough map, because these decisions drive the biggest numbers in a family budget for the next two decades. If you want a broader look at where money planning fits for growing families, our Foundations service page walks through it.

Eyes open beats winging it

None of this is a reason to wait until everything’s perfect. Nobody has ever been perfectly ready for a baby, and if you hold out for it, you’ll be holding out forever.

But there’s a difference between winging it and going in with your eyes open. Before the baby arrives, try this:

• Separate the one-off costs from the ongoing ones. The pram and cot are one-offs. Nappies, food, and childcare are the ongoing costs that need a permanent home in your spending plan.
• Build a buffer. A bit of cash set aside means a quiet month doesn’t turn into a crisis, especially if your income is variable.
• Plan around the lean fortnight, not the good one. If the budget works on your lower pay periods, the good ones become a bonus instead of a lifeline.
• Update your will and think about guardians. A new child is one of the biggest life-triggers for updating your estate planning — often the last thing people think of, and one of the most important. Our post on protecting loved ones with estate planning is a good starting point.

That preparation tends to take the pressure off the part that actually matters: being present for it, instead of doing sums in your head at 2am while rocking a baby back to sleep.

One more for the list: super

Here’s the cost nobody sees because it doesn’t show up on a bank statement. When one parent steps back from work, their super contributions stop, and that gap compounds quietly over the years. A career break of a few years early on can make a surprisingly large difference to a retirement balance decades later.

One option worth understanding is contribution splitting, where the working partner moves some of their super contributions across to the partner at home, helping keep both balances growing. Whether it suits you depends on your circumstances, so it’s worth getting advice before acting.

The same principle applies to investing for your child’s future — small, consistent contributions early on beat big lump sums later.

Run your own numbers

Every family’s situation is different: your income pattern, your leave entitlements, your childcare options, your goals. The common thread is that the couples who talk about it early, and put even a rough plan on paper, tend to handle the transition with far less stress.

If you’re expecting, trying, or just thinking about it, we’d love to help you get the money side sorted so you can focus on the good part.

Frequently asked questions

What are the biggest costs of having a baby?

The one-off purchases like the pram, cot and car seat are usually the smaller part. The bigger financial impact comes from ongoing costs such as nappies, formula, a larger grocery shop and eventually childcare, which often arrive at the same time household income drops while one parent is on leave.

How should we budget for a baby if our income is variable?

If your pay moves around with overtime, bonuses, commissions or seasonal work, build your budget around your leaner pay periods rather than your best ones, and set aside a cash buffer. That way a quiet fortnight becomes manageable instead of a crisis.

What financial questions should couples discuss before having children?

Useful questions include how many children you want, who will take time off work and for how long, whether the return to work will be part time, casual or full time, when childcare will start and what type, and whether you’re planning on public or private schooling.

What happens to superannuation when a parent takes time off work?

When a parent steps back from paid work, their employer super contributions stop, and that gap compounds over the years. One option worth understanding is contribution splitting, where the working partner moves some of their super contributions across to the partner at home. Whether it suits you depends on your circumstances, so seek personal advice.

Should we wait until we’re financially ready to have a baby?

Nobody is ever perfectly ready, and waiting for the perfect moment usually means waiting forever. The goal isn’t perfection, it’s going in with your eyes open: separating one-off costs from ongoing ones, building a buffer, and agreeing on a rough plan together before the baby arrives.

This article provides general information only and does not take into account your objectives, financial situation or needs. Please seek personal advice before making any financial decisions.